Shimano Ultegra Di2 R8100 Groupset

Product label: % Sale

Product label: % Sale

Customer Support Our dedicated team is always here to help with sizing, builds, and orders.

Warranty Protected 2-year manufacturer warranty

Shipping Included Included on most components and wheelsets. Free on orders over $100. Worldwide delivery with tracking.

Rider Approved We test and ride what we sell. Every product is hand-selected for quality and performance.

Shimano Ultegra Di2 R8100 Groupset

Shimano's race-quality Ultegra R8100 12-speed Di2 groupset brings flagship Dura-Ace technology to a more attainable tier — semi-wireless electronic shifting, refined hydraulic disc braking, and the wide, consistent gearing modern road bikes are built around.

Configured to suit your bike: choose your chainrings, crank length, cassette ratio and rotor size, and specify disc or rim brakes.

Why Riders Choose the Ultegra Di2 R8100

Race-quality Ultegra: flagship Dura-Ace performance one tier down.
12-speed Di2: fast, precise, low-maintenance electronic shifting.
Disc: ST-R8170 hydraulic disc,
Wide gearing: 11-30 or 11-34 cassette for road and climbing.
Made to fit: choice of chainrings and crank lengths.
Center Lock rotors: RT-CL900, 160 mm or 140 mm (disc builds).

Groupset Contains

Chainset	FC-R8100 — choice of rings and crank lengths
Cassette	CS-R8100-12 — 12-speed, 11-30 or 11-34
Chain	CN-M8100 — 12-speed
Front derailleur	FD-R8150 Di2
Rear derailleur	RD-R8150 Di2
Shifters / brake levers	ST-R8170 hydraulic disc with Di2 shifting, or ST-R8150 rim with Di2
Rotors	RT-CL900 Center Lock, 160 mm or 140 mm (disc only)
Calipers	BR-R8170 (disc)
Di2 parts	Battery, charging cable and two Di2 cables

Chainring sizes, crank lengths, cassette ratio and rotor size are selected at the options above. Bottom bracket is supplied to suit your frame — tell us your bike model.

Ultegra Di2 R8100 — FAQ

Is the shifting wireless?

Ultegra R8100 Di2 is semi-wireless: the shifters communicate wirelessly, while the derailleurs run from a central battery. Shifting is fast, precise and low-maintenance.

How fast does it ship?

Orders ship once processing is complete and a tracking number is generated. Delivery time depends on destination. For an ETA, message us with your location and the exact configuration you’re considering.

Do prices include duties and taxes?

Shipping and duty handling vary by destination. If DDP is offered for your destination, duties and import handling are included at checkout for eligible orders. If DDP is not available, duties and taxes may be collected by the carrier or local customs authority.

What is the warranty?

Warranty terms are provided by Shimano. If an issue occurs, Underdogs Cycling will guide you through the claims process and coordinate with the manufacturer where applicable.